Hello.

A stated above, could 300bhp be achieved from 380's or should I play it safe and fit 440's?? Opinions please..........

 

id speak to your mapper about it and do you have an uprated fuel pump

 

Cheers for your quick reply. No to uprated fuel pump (yet - can be bought if needed) but as only going to 300 bhp on this engine I thought 380's would do it, (on std fuel pump) but have been told they would be running at near 100% capacity. Just wondered what peoples thoughts were?

 

These are just estimates

Injector Size.................BHP @3bar fuel press................. BHP @3.5bar fuel press

380............................276......................................299
440............................320......................................346
550............................400......................................432
650............................473......................................511
740............................538......................................581
800............................582......................................628
850............................618......................................668
880............................640......................................691
960............................698......................................754
1000...........................727......................................786
1200...........................873......................................943
1600...........................1164.....................................1257

 

Well if you change your injectors you will need to spend money on a new ecu (which is the safest way imo)
Many people who run the polarperformance chips can get quite near that mark but some don't it all depends on the health of their engines etc.

What bhp are you runnng now?

 

Was running 262 before de-cat and fmic. Thinking of a PP chip incorparating these mods. Was thinking that with the upped boost I would be pushing close to the 300 mark and maxing out the 380's. Last thing I want is to do is run lean. If I bought 440's then I could specify these when I ordered the chip. That is my current thinking (with my limited knowledge). I'll email Scott T and see what he thinks.

Cheers Tim.

 

Had the scooby ecu (polar performance chip) which runs at 1.1 bar with tdo5 and 380cc injectors (standard original fuel pump and standard reg). I also then fitted a fuel cut defender and ran a dawes device with boost set at 1.2 bar using a knock link and lamba link for monitoring with straight through exhaust ported headers , free flowing air filter on my classic wrx subaru for about 8 years with no probs at all , using a standard borg and beck clutch and standard gear box , car ran a dream with no probs . best bhp to money mod i bought , back in the early days they were £65 but were done as a hobby , now he runs his own business how times have moved on , car was fast enough for the road beleive me . Car had to be running around 300bhp/300lbs any more torque and you will need an uprated clutch and then up-rated gear box .

Mark

 

Cheers for the advice, sounds exactly what I'm after. Don't want big power as its a 14 year old engine but I feel it is still capable of more. Clutch was up-rated a couple of years ago when the old one gave up the ghost. FCD sounds like a good plan!

 

If you go for just the polar performance chip you don't require a fcd as the limit is raised to 1.1 bar boost , 1.2 bar fuel cut this is the maximum for the early map sensor , i bought a hks fcd and just had it set at the first setting as a fcd is tricking the ecu so be careful , this then allowed me to use the dawes device set at 1.2 bar any more than this and i got knocklink activity this was running a larger 99-00 intercooler rather than the standard slanty crap one , you can fit a later map sensor but need the ecu calibrating to suit . lamba warning indication stayed healthy.

Mark

 

To answer your OP, yes 380's can run 300 Bhp.

But as you say it's close to their limit, my car was dyno'ed at 308 Bhp with the std 380's and I've seen cars make ~320 Bhp with them, that's the max I'd say.

It depends on what the car is going to be used for, i.e. a road car will spend a tiny amount of time at max power compared to a track car.

 

Yep, had over 320hp in my old RA.

Turned up the FP, added a boost limit defender, whacked boost up to around 1.4-1.5 bar, added OB, kept an eye on the KL and had loads of fun.

All on a Z4 ECU.

 

I made 324bhp 293lbsf with my 93 wrx at surrey rolling road few years back using 380's,power fc,1.1 bar boost and standard fuel pressure and used to hit 1.2 bar on the road

 

Over 300 can be done on 380's, it ain't really safe so don't blame me.









<<<

 

Thats at 1bar of boost

 

those figures are a bit on the cautious side, i'm running 340bhp on the standard fuel setup (bar fuel pump). my00 uk turbo

 

With 440cc injectors, remember.

 

I was running 309BHP on my 380cc;s on a 96 v2 sti import, it had a similar board to the polar in it, uprated AP organic and 2.5 bar sensor and a standard tmic. And 380's were not anywhere near maxed.

But i think all these figures will vary from car to car so ideally speak to the mapper who will map yours and he/she will advise.

 

Mines un-remapped, IDC is 100% from just over 5K rpm ish.

Like I said, it ain't safe.

 

Your injectors are 440's I have mine remapped, added a fuel pump and 3 way solinod and I have 372BHP uk 2000

 

The PP chip won't support 440's (from Scott T's info ) so from what I have read I should be ok fuelling-wise at standard pressure. As soon as I have fitted the chip I'll be having it rolling roaded anyway (to see what it is putting out ) so that will check to the fuelling. If there is a problem I can go from there. Cheers for the info chaps and I'll post up the results when fitted

 

I made 313bhp on my first WRX(MY95) 4 years ago.

380cc injectors
FMIC
Apexi IK
Walbro
and an SB ecu with the STI factory chip, just under 1.2bar

 

Trust you to spot this thread Jay You know my secrets now!!

 

i realised that, its why i went back and edited it to add the my00 bit, supose should have said 440's lol

 

I dont miss a trick Tim...